723213 has 12 divisors (see below), whose sum is σ = 1055808. Its totient is φ = 477000.

The previous prime is 723209. The next prime is 723221. The reversal of 723213 is 312327.

723213 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 723213 - 2² = 723209 is a prime.

It is a Curzon number.

723213 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (723263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 588 + ... + 1338.

It is an arithmetic number, because the mean of its divisors is an integer number (87984).

2⁷²³²¹³ is an apocalyptic number.

It is an amenable number.

723213 is a deficient number, since it is larger than the sum of its proper divisors (332595).

723213 is a wasteful number, since it uses less digits than its factorization.

723213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864 (or 861 counting only the distinct ones).

The product of its digits is 252, while the sum is 18.

The square root of 723213 is about 850.4193083415. The cubic root of 723213 is about 89.7612188964.

It can be divided in two parts, 7 and 23213, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 723213 in words is "seven hundred twenty-three thousand, two hundred thirteen".